Configuring the Advertisement Interval for the VRRP Master Router

By default, the master router sends VRRP advertisement packets every second to all members of the VRRP group. These packets indicate that the master router is still operational. If the master router fails or becomes unreachable, the backup router with the highest priority value becomes the new master router.

You can modify the advertisement interval in seconds or in milliseconds; the interval must be the same for all routing platforms in the VRRP group.

Modifying the Advertisement Interval in Seconds

To modify the time, in seconds, between the sending of VRRP advertisement packets, include the advertise-interval statement:

advertise-interval seconds; 

You can include this statement at the following hierarchy levels:

• [edit interfaces interface-name unit logical-unit-number family inet address address vrrp-group group-number]
• [edit logical-routers logical-router-name interfaces interface-name unit logical-unit-number family inet address address vrrp-group group-number]

The interval can be from 1 through 255 seconds.

Modifying the Advertisement Interval in Milliseconds

To modify the time, in milliseconds, between the sending of VRRP advertisement packets, include the fast-interval statement:

fast-interval milliseconds; 

You can include this statement at the following hierarchy levels:

• [edit interfaces interface-name unit logical-unit-number family inet address address vrrp-group group-number]
• [edit logical-routers logical-router-name interfaces interface-name unit logical-unit-number family inet address address vrrp-group group-number]

The interval can be from 100 through 999 milliseconds.

NOTE: In the VRRP PDU, the JUNOS software sets the advertisement interval to 0. When you configure VRRP with other vendors' routers, the fast-interval statement works correctly only when the other routers also have an advertisement interval set to 0 in the VRRP PDUs. Otherwise, the JUNOS software interprets other routers' settings as advertisement timer errors.